SSAW steel pipe (spiral submerged arc welded steel pipe) is formed by spiral bending of hot-rolled strip steel, and spiral seam steel pipe (also called spiral welded pipe, spiral pipe spiral steel pipe) is formed by automatic welding of submerged arc for inner and outer joints. welding line shape like a helix. It is using the same welding technology of Submerged Arc-Welding with LSAW pipe. Differently, SSAW pipe is spiral welded where the LSAW is longitudinally welded. The manufacturing process is rolling the steel strip, to make the rolling direction have an angle with the direction of the pipe center, forming and welding, so the welding seam is in a spiral line.
| The raw material of the SSAW steel pipe includes steel coil, welding wire, flux. All of raw materials must be through strict physical and chemical maintenance before the investment. | ||||||||
| Standard | Grade | Chemical Composition(max)% | Mechanical Properties(min) | |||||
| C | Si | Mn | P | S | Tensile Strength(Mpa) | Yield Strength(Mpa) | ||
| API 5CT | h40 | – | – | – | – | 0.03 | 417 | 417 |
| J55 | – | – | – | – | 0.03 | 517 | 517 | |
| K55 | – | – | – | – | 0.3 | 655 | 655 | |
| API 5L PSL1 | A | 0.22 | – | 0.9 | 0.03 | 0.03 | 335 | 335 |
| B | 0.26 | – | 1.2 | 0.03 | 0.03 | 415 | 415 | |
| X42 | 0.26 | – | 1.3 | 0.03 | 0.03 | 415 | 415 | |
| X46 | 0.26 | – | 1.4 | 0.03 | 0.03 | 435 | 435 | |
| X52 | 0.26 | – | 1.4 | 0.03 | 0.03 | 460 | 460 | |
| X56 | 0.26 | – | 1.4 | 0.03 | 0.03 | 490 | 490 | |
| X60 | 0.26 | – | 1.4 | 0.03 | 0.03 | 520 | 520 | |
| X65 | 0.26 | – | 1.45 | 0.03 | 0.03 | 535 | 535 | |
| X70 | 0.26 | – | 1.65 | 0.03 | 0.03 | 570 | 570 | |
| API 5L PSL2 | B | 0.22 | 0.45 | 1.2 | 0.025 | 0.015 | 415 | 415 |
| X42 | 0.22 | 0.45 | 1.3 | 0.025 | 0.015 | 415 | 415 | |
| X46 | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | 435 | 435 | |
| X52 | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | 460 | 460 | |
| X56 | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | 490 | 490 | |
| X60 | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | 520 | 520 | |
| X65 | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | 535 | 535 | |
| X70 | 0.12 | 0.45 | 1.7 | 0.025 | 0.015 | 570 | 570 | |
| X80 | 0.12 | 0.45 | 1.85 | 0.025 | 0.015 | 625 | 625 | |
| ASTM A53 | A | 0.25 | 0.1 | 0.95 | 0.05 | 0.045 | 330 | 330 |
| B | 0.3 | 0.1 | 1.2 | 0.05 | 0.045 | 415 | 415 | |
| ASTM A252 | 1 | – | – | – | 0.05 | – | 345 | 345 |
| 2 | – | – | – | 0.05 | – | 414 | 414 | |
| 3 | – | – | – | 0.05 | – | 455 | 455 | |
| EN10217-1 | P195TR1 | 0.13 | 0.35 | 0.7 | 0.025 | 0.02 | 320 | 320 |
| P195TR2 | 0.13 | 0.35 | 0.7 | 0.025 | 0.02 | 320 | 320 | |
| P235TR1 | 0.16 | 0.35 | 1.2 | 0.025 | 0.02 | 360 | 360 | |
| P235TR2 | 0.16 | 0.35 | 1.2 | 0.025 | 0.02 | 360 | 360 | |
| P265TR1 | 0.2 | 0.4 | 1.4 | 0.025 | 0.02 | 410 | 410 | |
| P265TR2 | 0.2 | 0.4 | 1.4 | 0.025 | 0.02 | 410 | 410 | |
| EN10217-2 | P195GH | 0.13 | 0.35 | 0.7 | 0.025 | 0.02 | 320 | 320 |
| P235GH | 0.16 | 0.35 | 1.2 | 0.025 | 0.02 | 360 | 360 | |
| P265GH | 0.2 | 0.4 | 1.4 | 0.025 | 0.02 | 410 | 410 | |
| EN10217-5 | P235GH | 0.16 | 0.35 | 1.2 | 0.025 | 0.02 | 360 | 360 |
| P265GH | 0.2 | 0.4 | 1.4 | 0.025 | 0.02 | 410 | 410 | |
| EN10219-1 | S235JRH | 0.17 | – | 1.4 | 0.04 | 0.04 | 360 | 360 |
| S275JOH | 0.2 | – | 1.5 | 0.035 | 0.035 | 410 | 410 | |
| S275J2H | 0.2 | – | 1.5 | 0.03 | 0.03 | 410 | 410 | |
| S355JOH | 0.22 | 0.55 | 1.6 | 0.035 | 0.035 | 470 | 470 | |
| S355J2H | 0.22 | 0.55 | 1.6 | 0.03 | 0.03 | 470 | 470 | |
| S355K2H | 0.22 | 0.55 | 1.6 | 0.03 | 0.03 | 470 | 470 | |
SSAW pipe takes form by rolling and welding a steel strip in a way that the pivotal direction is oblique to the axis or pipe center, making the weld seam in a spiral line. LSAW pipes are produced by molding steel sheets to a cylinder and joining the ends together by welding in a straight line.
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